|Year|National Champion|Score|Runner-Up|Host or site|
|---|---|---|---|---|
|2001|UCLA|5-4|Stanford|Stanford University, Avery Aquatic Center, Stanford, California|
|2002|Stanford|8-4|UCLA|USC, McDonald's Swim Stadium, Los Angeles, California|
|2003|UCLA (2)|4-3|Stanford|UC San Diego, Canyonview Pool, San Diego, California|
|2004|USC|10-8|Loyola Marymount|Stanford University, Avery Aquatic Center, Stanford, California|
|2005|UCLA (3)|3-2|Stanford|University of Michigan, Canham Natatorium, Ann Arbor, Michigan|
|2006|UCLA (4)|9-8|USC|UC Davis, Schaal Aquatics Center, Davis, California|
|2007|UCLA (5)|5-4|Stanford|Long Beach State, Joint Forces Training Base, Los Alamitos, California|
|2008|UCLA (6)|6-3|USC|Stanford University, Avery Aquatic Center, Stanford, California|
|2009|UCLA (7)|5-4|USC|University of Maryland, Eppley Recreation Center Natatorium, College Park, Maryland|
|2010|USC (2)|10-9|Stanford|San Diego State, Aztec Aquaplex, San Diego, California|
|2011|Stanford (2)|9-5|California|University of Michigan, Canham Natatorium, Ann Arbor, Michigan|
|2012|Stanford (3)|6-4|USC|San Diego State, Aztec Aquaplex, San Diego, California|
|2013|USC (3)|10-9 5OT|Stanford|Harvard University, Blodgett Pool, Cambridge, Massachusetts|
|2014||||USC, Uytengsu Aquatics Center, Los Angeles, California|

Question: how many years has stanford been national champion?
Answer: 3